How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)

How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)

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Biswajit Tripathy - August 16, 2014 at 10:14am
Whatever I do I am unable to downgrade the baseband for my iPhone 3GS running iOS 5.1.1 from 6.15.00. Have tried all steps on all forums. Its been 4 days I have been trying continuously....